Abrasive wheel



1958 R. w. BERINSTEIN ETAL 2,818,693

, ABRASIVE WHEEL Filed Oct. 15, 1956 INVENTORS RUSSELL w. BERNSTEIN VALECKQ BLOCK ATTORNEY United States Patent ABRASIVE WHEEL Russell W.Bernstein and Aleck Block, Culver City, Calif. Application October 15,1956, Serial No. 616,014

7 Claims. (Cl. 51-194) This invention relates to an abrasive wheel whichis adapted to be used for polishing and grinding purposes. Thisinvention is a continuation-in-part and improvement upon the inventiondisclosed in our co-pending application Serial No. 539,622, filedOctober 10, 1955.

It is an object of our invention to provide a wheel which is formedentirely of cardboard, paper and similar economical and disposablematerials so that it can be easily discarded and replaced when it hasbecome worn. Our wheel in use is supported by rigid metal flanges whichimpart to it sufiicient rigidity so that it can perform cuttingoperations beyond those normally achieved by ordinary abrasive wheelsformed of such materials.

It is a further object of our invention to provide an abrasive wheelwhich is adapted for use in grinding and polishing concave surfaces andwhich can also be used fora large variety of grinding, cutting andpolishing operations.

In essence, our invention contemplates a substantially circular wheel,around the outer periphery of which extend a plurality of overlappingsegments of abrasive coated material. The wheel comprises a completeunit which is capable of easy handling and shipment. In use, the ends ofthe abrasive segments are held between a pair of metal flanges whichprevent their separation from the wheel.

It is an object of our invention to provide an abrasive wheel having theadvantages and benefits of the structure set forth above. It is afurther object of our invention to provide a wheel of the type describedin which the abrasive segments overlap each other a substantial amount,so that as the exposed portions become worn, new abrasive is exposedfrom the portion of the abrasive segment disposed therebeneath, thusproviding fresh abrasive and extending the life of the wheel.

It is a further object of our invention to provide such a wheel in whichthe use of segments of abrasive material extending substantiallytransversely to the periphery of the wheel permits the formation of anabrasive wheel having a small radius without buckling or folding .of theabrasive material.

Another object of our invention is to provide a wheel of the typedescribed which is light in weight, simple and economical to manufactureand easy to replace when it has become worn. It is among the furtherobjects of our invention to provide such a wheel which is sturdy inconstruction and in which the abrasive segments will not becomeseparated from the wheel in use.

Our invention also comprises such other objects, advantages andcapabilities as will later more fully appear and which are inherentlypossessed by our invention.

While we have shown in the accompanying drawings a preferred embodimentof our invention, it should be understood that the same is susceptibleof modification and change without departing from the spirit of ourinvention.

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Referring to the drawings,

Fig. 1 is a side elevational view of our abrasive wheel, partly brokenaway to show the interior structure;

Fig. 2 is an end view of our abrasive Wheel in use, partly broken awayand shown in section;

Fig. 3 is a perspective view showing attachment of the abrasive segmentsto the mounting strip;

Pig. 4 is an enlarged perspective view showing the abrasive segments andmounting strip prior to their attachment to the core;

Fig. 5 is a side elevationalview of the wheel in use, partly detailed insection and partly indicated in dotted lines; v

Fig. 6 is a side elevational view of the core before mounting theabrasive segments thereon.

A preferred embodiment which has been selected to illustrate ourinvention comprises a core 10, which is preferably formed of twistedpaper. The core 10 is preferably circular in cross-section. A length ofthe core 10 sufficient to form a wheel of the desired circumference iscut from a long strip and its ends secured together by tape 11 or othersuitable attaching means. The result is the provision of a circular core10 as shown in Fig. 6 of the drawings.

A plurality of abrasive segments 12 are then cut or otherwise suitablyformed from a length of abrasive carrying material such as paper, clothor the like. Each of the abrasive segments 12 is preferablysubstantially oblong in shape. The segments 12 are then arranged in astraight line, with their longer edges adjacent each other. The segments12 are preferably disposed in an overlapping relationship in which eachsegment 12 overlaps half of the next adjacent segment 12.

A mounting strip 13, which may be formed of paper, cloth or plastic tapeor other suitable material is then attached by glue or the like so thatit extends transversely along the strip of segments 12, being secured tothe non-abrasive side of each of the segments 12. This structure is bestshown in Fig. 3 of the drawings.

The ends of the abrasive segments 12 are then brought up so as to form achannel, as best shown in Fig. 4 of the drawings. The circular core 10is then fitted within this channel, the strip of segments 12 beingcurved around the core 10. The length of the strip of segments12 should,of course, be equal to the circumference of the core 10.

A pair of cardboard side pieces 14 are then adhered to the opposite endportions of the abrasive segments 12 in such a manner that they form thesides of the wheel. The side pieces 14 are preferably formed of cardboador other suitable material and are circular,

having an outer circumference which is slightly smaller than that of thecircular core 10. The side pieces 14 also have circular open portionsadjacent their centers.

The outer periphery of each of the side pieces 14 is securely adhered tothe end portions of the abrasive segments 12, preferably with vinyl glueor other suitable adhesive material. The wheel which is so formed iscapable of being easily handled and packed for shipping and replacementpurposes.

In use, our wheel is preferably mounted between a pair of metal sideplates 15 and 16. The metal side plate 15 has a flange 17 which extendsthrough the open center portions of the side pieces 14 and into a rightangular shoulder 18 of the other side plate 16. The outer peripheries ofthe side plates 15 and 16 are only slightly smaller in circumferencethan the core 10, so that they overlap the end portions of the abrasivesegments 12 and the edges of the side pieces 14 and extend beyond theinner diameter of the core 10 in order to bind the abrasive segments1-2against the sides of the core to prevent their separation from the core10 during high speed rotational use of the wheel. 7

The side plates and 16 are provided with small centrally disposedcircular openings 19 and20'for mounting the assembly on the mandrel orother mounting device which is in turn operated by a. suitable source ofhigh speed rotation.

If twisted paper is used to form the circular core 10, it provides acertain amount of resiliency which is home ficial in the operation ofthe wheel.

In use, the entire outer periphery of the wheel presents a continuoussomewhat resilient convex abrasive surface. As the, abrasive segments 12become worn through use, portions offthe abrasive segments 12therebeneath become exposed, so that fresh abrasive is always presentand the life of the wheel is doubled. When the abrasive segments 12 arecompletely worn away, the wheel is usually replaced by separating themounting plates 15 and 16 and mounting a new wheel between them.

It' will be noted that the entire. area of the abrasive segments 12 isheld closely adjacent to the periphery of the wheel so that no whippingor flapping action takes place. There is no play or loose area betweenthe abrasive segments 12 and the core 10. The result is that our wheelprov-ides a very strong and positive cutting action.

We claim:

1. An abrasive wheel comprising a circular core formed of twist paper orthe like, said core being substantially circular in cross section, aplurality of abrasive segments having abrasive material on the outerside thereof, said segments being substantially oblong in shape, saidsegments being disposed so that their longer sides extend transverselyacross said core, said segments extending around the entire periphery ofsaid core, with each of said segments overlapping substantially half ofthe adjacent segment, a pair of circular cardboard side pieces, thediameter of said side pieces being slightlyless than the outer diameterof said core, the outer periphery of each of said side pieces overlyingand being adhered to an end portion of each of said abrasive segments,said segments being held so that their midportions overlie and are heldclosely adjacent to said core with their ends disposed toward the centerof said core.

2. The structure set forth in claim 1 and a pair of substantially rigidcircular side plates disposed on opposite sides of said side platesbeing slightly greater than the inner circumference of said core andslightly less than the outer circumference of said core, so that saidabrasive segments are disposed between the outer edges of said sideplates and said core, and means for clamping said side plates togetherto prevent separation of said segments from said core during high speedrotational use of said wheel.

3. An abrasive wheel comprising a circular core, a

plurality of abrasive segments having abrasive material on the outerside thereof, said segments being substantially oblong in shape, saidsegments being disposed so that their longer sides extend transverselyacross said core, said segments extending around the entire periphery ofsaid core, with each of said segments overlapping substantially half ofthe adjacent segment, a pair of circular cardboard side pieces, theouter periphery of each of said side pieces overlying and being adheredto an end portion of each of said abrasive segments, said segments beingheld so that their midportions overlie and are held closely adjacent tosaid core with their ends disposed toward the center of said core.

4. The structure set forth in claim 3, and a substantially circular sideplate disposed on each side of said wheel, the outer edge of each ofsaid side plates overlying the adjacent end portions of said abrasivesegments, and means for clamping said side plates together to preventseparation of said segments from said wheel during high speed rotationaluse of said wheel.

5. An abrasive wheel comprising a circular core, a plurality of abrasivesegments having abrasive material on the outer side thereof, saidsegments being disposed so that they extend transversely across saidcore around the entire periphery of said core, each of said segmentsoverlapping substantially half of the adjacent segment, a pair ofcircular side. pieces, each of said side pieces being, slightly smallerin outer circumference than said core, the outer edges of said sidepieces overlying and being adhered to the end portions of said segmentson the, opposite sides of said wheel, said segments being thereby heldso that their midportions overlie and are held closely adjacent to saidcore, with their ends disposed toward the center of said core.

6.. An abrasive wheel comprising a circular core, a plurality ofabrasive segments having abrasive material on the outer side thereof,said segments being disposed so that they extend transversely acrosssaid core around the entire periphery of said core, a pair of circularside pieces, each of said side pieces being slightly smaller in outercircumference than said core, the outer edges of said side piecesoverlying and being adhered to the end portions of said segments on theopposite sides of said wheel, said segments being thereby held so thateach of their entire midportions closely overlies and substantiallyfollowsthe contour of the periphery of said core, the ends of saidsegments being disposed toward the center of said core.

7. The structure set forth in claim 6, and a pair of substantiallycircular side plates disposed on opposite sides of said wheel, the outeredges of said side plates overlying the adjacent end portions of saidabrasive segments, and means for clamping said side plates together toprevent separation of said segments from said wheel during high speedrotational use of said wheel.

References Cited in the file of this patent UNITED STATES PATENTS233,211 Crooker Oct. 12, 1880 837,556 Fryer Dec. 4, 1906 1,377,598 PaoliMay 10, 1921 1,869,564 Johnston Aug. 2, 1932 2,447,748 Graham Aug. 24,1948 n iw y

